The word 'carelessly-mended' is a compound adjective formed from 'carelessly' and 'mended'. 'Carelessly' originates from the Old English 'carleas', meaning 'free from care', and 'mended' comes from the Old French 'amender', meaning 'to correct or improve'.

'Carelessly' evolved from the Old English 'carleas', while 'mended' transformed from the Old French 'amender' to the modern English 'mend'.

Initially, 'carelessly' meant 'free from care', but over time it evolved to mean 'without care or attention'. 'Mended' has largely retained its meaning of 'repaired'.